But some modern CPUs are surface mounted as well. It's often done to save space e.g. in modern laptops surface mounting the CPU allows the laptop to be thinner.
@JohnRennie at that time we used to stay on rent...our new house was being built...and it was hardly 4 months...and the landlord conspired with some local goons and got our PC stolen
@JohnRennie the next day when we saw the entrance in the morning...only the locking mechanism was destroyed...and the lock was on the floor open....undamaged
@JohnRennie the thieves somehow managed to get a copy of the room's key from the landlord...and just to fake things up, they unscrewed and broke the locking mechanism